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A131387 as a simple table

n a(n)
1 1
2 1
3 1
4 1
5 2
6 4
7 12
8 48
9 48
10 192
11 2880
12 2880
13 25920
14 552960
15 3265920
16 1935360
17 116121600
18 278691840
19 9405849600
20 26754416640
21 94058496000
22 3210529996800
23 869100503040000
24 423789959577600
25 927040536576000
26 135612787064832000

[1,1,1,1,2,4,12,48,48,192,2880,2880,25920,552960,
 3265920,1935360,116121600,278691840,9405849600,
 26754416640,94058496000,3210529996800,
 869100503040000,423789959577600,927040536576000,
 135612787064832000]

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Last modified May 1 14:05 EDT 2024. Contains 372174 sequences. (Running on oeis4.)